EP3687870A1 - Procédé de réglage ou de régulation d'une pression de freinage dans un système de freinage hydraulique d'un véhicule à moteur, dispositif et véhicule à moteur - Google Patents

Procédé de réglage ou de régulation d'une pression de freinage dans un système de freinage hydraulique d'un véhicule à moteur, dispositif et véhicule à moteur

Info

Publication number
EP3687870A1
EP3687870A1 EP18779243.7A EP18779243A EP3687870A1 EP 3687870 A1 EP3687870 A1 EP 3687870A1 EP 18779243 A EP18779243 A EP 18779243A EP 3687870 A1 EP3687870 A1 EP 3687870A1
Authority
EP
European Patent Office
Prior art keywords
brake pressure
vehicle speed
brake
predetermined
motor vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18779243.7A
Other languages
German (de)
English (en)
Inventor
Ulf Sintram
Frank Stebner
Stephan Alm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volkswagen AG
Original Assignee
Volkswagen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of EP3687870A1 publication Critical patent/EP3687870A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
    • B60T8/1766—Proportioning of brake forces according to vehicle axle loads, e.g. front to rear of vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2230/00—Monitoring, detecting special vehicle behaviour; Counteracting thereof
    • B60T2230/08—Driving in reverse
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2250/00—Monitoring, detecting, estimating vehicle conditions
    • B60T2250/04—Vehicle reference speed; Vehicle body speed

Definitions

  • the invention relates to a method for adjusting or regulating a brake pressure in a hydraulic brake system of a motor vehicle, a device for carrying out the method and a motor vehicle.
  • Noise phenomena are known as "mooing.” This is a narrow-band noise that occurs at a constant frequency between 300 - 800 Hz
  • this noise phenomenon occurs when a motor vehicle reverses, when the motor vehicle is moving at a low speed and a rear-axle brake pressure of less than 10 bar is present in the hydraulics of the rear disc brakes. As a rule, this phenomenon thus occurs only when reversing a motor vehicle at low speeds and low brake pressures.
  • a vehicle speed is determined during a reverse drive and compared with a predetermined critical vehicle speed. This is when both a vehicle speed below a critical
  • Vehicle speed and a brake pressure is below a critical brake pressure, the structure of a brake pressure in rear brakes blocked by means of an ESC hydraulic unit.
  • the disadvantage of this solution is that the function does not reverse the Motor vehicle recognizes and is thus applied when driving forward. Control even when driving forwards could lead to a load spectrum of valves of the ESC hydraulic unit increasing and possibly requiring measures to improve them. Comparing the vehicle speed and the brake pressure with the given critical vehicle speed and the predetermined critical brake pressure could result in increased demand on the capacity of the controller.
  • a method for adjusting or regulating a brake pressure in a hydraulic brake system of a motor vehicle. It is provided that in a first step by a detection device a
  • Reversing mode and in the reverse drive mode an initiation of a braking operation are detected. Regardless of one during braking by a
  • Brake actuation set system brake pressure can then a rear axle brake pressure is set to 0 bar.
  • the detection device then repeatedly or repeatedly or continuously detects a current vehicle speed and compares it with a predetermined vehicle speed.
  • the rear axle brake pressure is set to the system brake pressure or adjusted if the current one
  • Vehicle speed is greater than the predetermined vehicle speed.
  • the detection device checks whether the motor vehicle is in a reverse drive mode. In a second step, the detection device detects that a braking process is initiated.
  • Braking operation causes a rear axle brake pressure to be set to 0 bar. This has the consequence that only brakes with the front brake. A “mooing" is then impossible.
  • the detection device then continuously detects a current
  • the rear axle brake pressure is set to the system brake pressure. This has the advantage that the current vehicle speed is greater than the predetermined vehicle speed.
  • Rear axle brake pressure is adjusted in a predetermined critical operating condition so that the occurrence of a noise phenomenon is avoided. It is for example possible that the detection device detects that a reverse gear is engaged, and thus the motor vehicle in a
  • Reverse mode is located. This can be done for example by means of a sensor which is adapted to detect a predetermined position of a shift lever of the motor vehicle to provide a signal for a reversing light.
  • the detection means may e.g. detect that a driver's foot touches or actuates a brake pedal, thus initiating a braking operation.
  • a brake light switch which can be designed as a Hall sensor in a master cylinder of a brake booster.
  • the brake light switch can be a driving over a predetermined closing of the
  • Braking process can be detected before a setting of the system brake pressure, ie before a braking effect.
  • the control unit may e.g. certain valves of the brake system closed or
  • the control unit may for example be a brake control device, also called electronic stability control (ESC), which is adapted to reduce pressure build-up on individual wheel brakes or a single wheel brake or to prevent pressure build-up, whereby a braking effect can be prevented or minimized.
  • the rear axle brake pressure can thus be decoupled from the system brake pressure, and thus for example be a value of 0 bar.
  • the detection means may detect an actual vehicle speed and compare it with a predetermined speed value, namely the predetermined vehicle speed. The predetermined one
  • Vehicle speed may have an amount which is an upper limit of the range in which said noises occur or in which the
  • Rear axle brake is not required to achieve a necessary braking effect. If the value of the current vehicle speed is above this predetermined
  • control unit may e.g. certain valves open or close, whereby the rear axle brake pressure assumes the value of the system brake pressure.
  • a development of the method provides that the system brake pressure by the
  • Detection device is repeatedly or continuously detected and compared with a predetermined system brake pressure, if the current vehicle speed is less than the predetermined vehicle speed.
  • the rear axle brake pressure is set to the system brake pressure, if the system brake pressure is greater than the predetermined System brake pressure is.
  • the system brake pressure is greater than a predetermined system brake pressure. If this is the case, the rear axle brake pressure is set to the system brake pressure.
  • System brake pressure is. It may be that the current vehicle speed is less than the predetermined vehicle speed. Thus is the
  • valves can be further adjusted by the control unit so that the rear axle brake pressure remains at a value of 0 bar.
  • System brake pressure can in this case be continuously detected by the detection device and compared with a predetermined system brake pressure.
  • the predetermined system brake pressure may be an upper limit of a range of values in which the noises may occur. If the system brake pressure is above the predetermined system brake pressure, the valves may be opened causing the rear axle brake pressure to assume the value of the system brake pressure. Otherwise, it may be that the rear axle brake pressure remains set to 0 bar.
  • a development provides that the reverse driving mode is detected by means of a detection of an engaged reverse gear by the detection device.
  • detection of an engaged reverse gear detects the presence of a reverse motor.
  • This has the advantage that an easily recognizable reliable identification feature for a reverse driving mode is given.
  • the detection device recognizes the reverse drive mode by virtue of the fact that a reverse gear is engaged in the gearshift.
  • a further development provides that the reverse driving mode is detected by detecting a direction of rotation of a wheel of the motor vehicle.
  • a reverse driving mode is detected by the detection means by this one
  • Detected direction of rotation of at least one wheel which is present in a reverse drive.
  • a reverse driving mode is also detected when the motor vehicle wants to backwards, but there is no reverse gear is engaged.
  • a reverse driving mode is detected by means of a wheel pulser which can measure a wheel rotation of a wheel.
  • a wheel encoder or wheel speed sensor may be located on a respective wheel and the wheel rotation and detect the direction of rotation of the respective wheel.
  • individual components of the Radimpulsgebers be connected to the wheel in series.
  • Brake light switch is detected.
  • the initiation of the braking operation is detected by means of a brake light switch.
  • the predetermined vehicle speed is between 5 km / h and 15 km / h.
  • the predetermined vehicle speed is between 5 km / h and 15 km / h.
  • a development of the invention provides that the predetermined system brake pressure is in a range of 3 bar to 10 bar.
  • the critical range in which the noise can occur is limited by a predetermined system brake pressure, which has a value of 3 bar to 10 bar. This has the advantage that a critical range can be defined.
  • the invention also includes an apparatus for performing one of the methods.
  • the device comprises a control unit.
  • the control unit has a
  • the processor device can have at least one microprocessor and / or at least one microcontroller.
  • the processor device can have program code which is set up to execute the embodiment of the method according to the invention when executed by the processor device.
  • the program code can be stored in a data store
  • Processor device be stored.
  • the invention also includes a motor vehicle comprising an apparatus for performing one of the methods.
  • the invention also includes developments of the device according to the invention and the motor vehicle according to the invention, which have features as they are already in
  • FIG. 1 shows a device according to the invention in a motor vehicle
  • FIG. 2 shows a sequence of a method according to the invention.
  • the exemplary embodiment explained below is a preferred embodiment of the invention.
  • the described components of the embodiment each represent individual features of the invention that are to be considered independently of one another, which also each independently further develop the invention and thus also individually or in a different combination than the one shown as part of the invention.
  • the described components of the embodiment each represent individual features of the invention that are to be considered independently of one another, which also each independently further develop the invention and thus also individually or in a different combination than the one shown as part of the invention.
  • the motor vehicle 2 comprises a hydraulic brake system 1. To simplify the sketch and to
  • the hydraulic brake system 1 may comprise a hydraulic 3, which may be connected to three hydraulic lines 13, wherein in the hydraulic lines 13, a system brake pressure Ps, a front axle brake pressure Pf and a rear axle brake pressure Pr may exist.
  • the system brake pressure Ps can be generated by means of a brake actuator 8 and depending on a position of a brake actuator 8
  • a brake actuator 8 may be, for example, a brake booster with master cylinder.
  • the Schuachsbremstik Pr may consist in a hydraulic line 13, which connects the hydraulics 3 with the brake actuator 8 fluidly.
  • the front axle brake pressure Pf may prevail in a hydraulic line 13 which fluidly connects the hydraulics 3 to a front axle brake 6.
  • Rear axle brake pressure may prevail in a hydraulic line which fluidly connects the hydraulics 3 to a rear axle brake 7.
  • the hydraulic system 3 may comprise valves which allow the front axle brake pressure Pf and / or the
  • the hydraulic system 3 can hydraulically connect the hydraulic lines 13 to the front wheel brake 6 and / or the rear wheel brake 7 to the hydraulic line 13 for the brake control 8.
  • the front axle brake pressure Pf and / or the rear axle brake pressure Pr can assume the value of the system brake pressure Ps.
  • the hydraulic 3 can close respective valves, whereby the respective pressure Pf, Pr is modulated in a wheel brake.
  • the pressure of a respective wheel brake can be controlled individually, so that separate valves can be located in the hydraulic system 3 for each wheel brake.
  • the control and / or regulation of the hydraulic system 3 can be effected by a control unit 5.
  • the hydraulic system 3 and the control unit 5 may be part of a brake control device.
  • the control unit 5 may be configured to receive signals from the detection device 4.
  • the detection device 4 may include a sensor for detecting an inserted
  • Reverse 4a include a brake light switch 4b, a pressure sensor 4c, and at least one wheel speed sensor 4d.
  • the sensor for detecting an engaged reverse gear 4a may be adapted to detect a position of a shift lever 1 1, which may be adapted to a gear of a transmission 10th
  • the detection device 4 may also include a brake light switch 4b, which may be arranged on a brake pedal 9.
  • the brake light switch 4b may be configured to detect an exceeding of a predetermined position of the brake pedal 9. The predetermined position may be selected such that at said position of the
  • Brake pedal 9 still no braking effect occurs because the brake actuator 8 has not yet built sufficient system brake pressure Ps, which would lead to a braking operation by the front brake 6 and / or the rear brake 7.
  • Detector 4 may also include a pressure sensor 4c, which may be configured to detect the system brake pressure Ps.
  • the detection device 4 can also comprise wheel speed sensors 4d, which can be arranged on a respective wheel and can detect a respective wheel speed as well as its direction of rotation. From a respective wheel speed, the detection device 4 can calculate a vehicle speed v over a respective wheel diameter.
  • the respective sensors The detection device 4a, 4b, 4c, 4d may be electrically conductively connected to each other by means of electrical lines 12, whereby a signal transmission may be possible.
  • Fig. 2 shows a sequence of a method according to the invention.
  • a reverse driving mode can be detected by the detection device 4 of the motor vehicle 2.
  • a reverse driving mode may describe a state in which the motor vehicle 2 is traveling in the reverse direction or set to reverse.
  • a reversing of the motor vehicle 2 can be detected, for example, via rotational direction-detecting wheel speed sensors of the detection device 4d.
  • An adjustment of the motor vehicle 2 to a reverse drive can be detected, for example, by detecting the position of the shift lever 1 1 by means of the sensor for detecting an engaged reverse gear 4a.
  • the detecting means 4 can monitor whether a braking operation is initiated S2.
  • a braking process can by a
  • the system brake pressure Ps is set by means of the brake actuator 8 to a working pressure, whereby at least one brake 6,7 of the hydraulic brake system 1 is a braking effect.
  • the initiation of such a braking operation can be detected, for example, by means of the brake light switch 4b of the detection device 5 or by means of a wheel speed sensor 4d, when a movement of the motor vehicle 2 in the rearward direction is detected.
  • the rear axle brake pressure Pr can be set by the system brake pressure Ps, for example by closing a valve of the hydraulic system 3 by the control unit 5 to a value of 0 bar S3. It may be that there must be a voltage on the valve to keep it closed.
  • Detection device 4 detects an actual vehicle speed, for example by means of the wheel speed sensor 4d, and from the control unit 5 with the predetermined
  • Vehicle speed vc be compared S4.
  • Vehicle speed vc may be, for example, 10 km / h. Is the current one
  • Vehicle speed v greater than the predetermined vehicle speed vc, so a noise is unlikely and the control unit 5 can control the hydraulic 3 so that this the Schuachsbremstik Pr to the value of System brake pressure Ps regulates S6. If the current vehicle speed v is less than the predetermined vehicle speed vc, it may vary depending on the
  • System brake pressure Ps come to a noise. For this reason, in this case, the system brake pressure Ps is detected by the pressure sensor 4c of the detector 4 and compared with a predetermined system brake pressure Psc S5. If the system brake pressure Ps is below the predetermined system brake pressure Psc, the valve remains closed and the rear axle brake pressure Pr remains at 0 bar.
  • the predetermined system brake pressure Psc can be, for example, 6 bar. If the system brake pressure Ps is greater than the predetermined system brake pressure Psc, the control unit 5 can control the hydraulic system 3 in such a way that it changes the rear axle brake pressure Pr to the value of the
  • System brake pressure Ps controls S6.
  • the method can prevent a condition in which noise may be generated at the rear wheel brake 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

L'invention concerne un procédé de réglage ou de régulation d'une pression de freinage dans un système de freinage hydraulique (1) d'un véhicule à moteur (2). Un dispositif de détection (5) permet de détecter un mode conduite en marche arrière, et dans le mode conduite en marche arrière, le déclenchement d'un processus de freinage est détecté par le dispositif de détection (5), puis une pression de freinage d'essieu arrière (Pr) est placée sur 0 bar par une unité de commande (6) indépendamment d'une pression de freinage système (Ps) réglée pendant le processus de freinage par un actionnement (8) du frein, et une vitesse actuelle (v) du véhicule est détectée à plusieurs reprises par le dispositif de détection (5) et comparée à une vitesse prédéfinie (vc) du véhicule. La pression de freinage d'essieu arrière (Pr) est réglée par l'unité de commande (6) sur la pression de freinage système (Ps), au cas où la vitesse actuelle (v) du véhicule serait supérieure à la vitesse prédéfinie (vc) du véhicule.
EP18779243.7A 2017-09-28 2018-09-14 Procédé de réglage ou de régulation d'une pression de freinage dans un système de freinage hydraulique d'un véhicule à moteur, dispositif et véhicule à moteur Withdrawn EP3687870A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017217268.1A DE102017217268A1 (de) 2017-09-28 2017-09-28 Verfahren zum Einstellen oder zur Regelung eines Bremsdrucks in einer hydraulischen Bremsanlage eines Kraftfahrzeugs, Vorrichtung und Kraftfahrzeug
PCT/EP2018/074836 WO2019063312A1 (fr) 2017-09-28 2018-09-14 Procédé de réglage ou de régulation d'une pression de freinage dans un système de freinage hydraulique d'un véhicule à moteur, dispositif et véhicule à moteur

Publications (1)

Publication Number Publication Date
EP3687870A1 true EP3687870A1 (fr) 2020-08-05

Family

ID=63708292

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18779243.7A Withdrawn EP3687870A1 (fr) 2017-09-28 2018-09-14 Procédé de réglage ou de régulation d'une pression de freinage dans un système de freinage hydraulique d'un véhicule à moteur, dispositif et véhicule à moteur

Country Status (3)

Country Link
EP (1) EP3687870A1 (fr)
DE (1) DE102017217268A1 (fr)
WO (1) WO2019063312A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7744168B2 (en) * 2005-09-07 2010-06-29 Bendix Commercial Vehicle Systems Llc Brake control system
DE102009055059B4 (de) * 2009-12-21 2023-02-02 Robert Bosch Gmbh Reduzieren des Lenkmoments bei Bremsmanövern
DE102011117502A1 (de) 2011-11-02 2013-05-02 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Verfahren zur Regelung einer hydraulischen Bremsanlage eines Kraftfahrzeugs bei Rückwärtsfahrten
FR2995858B1 (fr) * 2012-09-26 2014-10-24 Renault Sas Procede de freinage d'un vehicule automobile
DE102015011041A1 (de) * 2015-08-22 2016-03-24 Daimler Ag Verfahren zum Betreiben einer Bremsanlage eines Nutzfahrzeugs, insbesondere eines Gelenkbusses

Also Published As

Publication number Publication date
WO2019063312A1 (fr) 2019-04-04
DE102017217268A1 (de) 2019-03-28

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